The number of VLP seismic events (standard values 5-12) is high, 15.5 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is low, 0.72 bar (standard values <1 bar). The amplitude of puffing is medium, ~60 mbar.

Tiltmeters analysis does not show any significant deformation of the volcano edifice

Thermal activity of explosive events is medium. The number of thermal transients in the NE sector of the crater (standard = 100) is high, 1397. The amplitude of thermal transients is low, 1 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 11 m/s.

MODIS thermal anomalies are low: 6 MW (20:30 UTC yesterday).

Rockfall activity is medium. The number of rockfalls is 3 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 150 t/d

CO₂ flux based on the C/S is not available

Indice di Attività Vulcanica: high

• Seismic (VLP) rate HIGH
• Seismic tremor HIGH
• Puffing MEDIUM
• Acustic pression of explosions LOW
• Thermal activity MEDIUM
• SO₂ flux MEDIUM
• CO₂ flux not available
• Rockfall activity MEDIUM

The volcanic activity is generally characterized by strombolian explosions and puffing located at NE crater sector. In the last 24h, the Stromboli volcano showed a HIGH degassing activity (puffing with values of about 60 mbar). The amplitude pressure of the explosions is MEDIUM (max acoustic pressure 0.7 bar). The number of explosions (thermal transients) are HIGH, with a LOW thermal amplitude and LOW exit velocity of pyroclasts. The volcanic tremor shows HIGH values. The number of VLP events showed HIGH values (15.5 events/hour). MODIS/VIIRS images showed LOW thermal anomalies (max 6 MW). SO2 flux in the last 24 hours shows MEDIUM values (150 t/d). The rockfall activity is MEDIUM (2 events with LOW pseudo-volumes and 1 event with HIGH pseudo-volume associated). The volcanic activity index is HIGH.